deadly tornados. a rare and terrifying event, two monster twisters, touched down within roughly a mile of each other. their winds reportedly topped 200 miles per hour. this morning close to three-quarters of the town is either heavily damaged or destroyed. at least one person is dead. 16 others are in critical condition. abc's clayton sandell has the latest. >> reporter: tornados raking across the great plains. this one near wisner, nebraska, is massive, nearly a mile wide. >> look at that. look at that. >> reporter: tearing across the landscape. >> we have multiple tornados on the ground here. >> reporter: when suddenly a second tornado forms out of the first and touches down. rarely seen by the human eye, caught on video. >> i have never seen anything like this. >> we started hearing everything rip apart and the rain and the house ripping apart -- yeah, pilger is in major destruction right now. >> reporter: the emergency crews are searching for people trapped